Health Info

Pityriasis Rosea

Definition

Pityriasis rosea is a common skin rash. The rash is scaly and reddish-pink. It may first appear on the back, stomach, or chest. The rash can then spread to the neck, arms, and legs.

Causes

The cause of pityriasis rosea is unknown. It may be caused by viruses or a certain medication, such as antibiotics or heart medications.

Risk Factors

Pityriasis rosea occurs most often in children and young adults. It is more likely to occur in the spring and fall.

Symptoms

Before a rash appears, the first symptoms may be similar to the common cold. They may include:

Fatigue

Fever

Headache

Sore throat

Joint pain

Nausea and loss of appetite

Irritability

When the rash appears, symptoms may include:

Having a herald patch—often the first lesion to appear.

Large, oval, scaly patch that is often on the back, stomach, armpit, or chest

Patches found on the back tend to form a Christmas tree pattern

More patches that appear after several days

Patches are not typically itchy, but mild to severe itching may occur:

Itching worsens when the body overheats

This may happen during physical activities or after taking a hot shower

Skin redness or inflammation

Diagnosis

You will be asked about your symptoms and medical history. A physical exam will be done. Pityriasis rosea can usually be diagnosed by looking at your rash.You may be referred to a doctor who specializes in skin disorders (dermatologist) if the rash is difficult to identify.

Other Treatments

Avoid physical activities that can raise your body temperature. This can make itching worse.

Avoid hot baths or showers. Oatmeal baths may also soothe the itching.

Sunlight or medical treatment with artificial ultraviolet light may speed the healing process. Be careful to avoid sunburn.

Prevention

There is no known way to prevent pityriasis rosea. It does not spread from person to person. It is not likely to recur. This rash does not leave permanent marks. However, some people with dark skin may have some skin discoloration. This will usually fade with time.

Revision Information

This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.